La San Marco 85-S Serie Modo De Empleo Y Mantenimiento página 40

PROBleM
10. The machine feeds water
from one serving
although the serving has
not been selected.
11. 85 S models: one unit
serves water continuously.
12. The steamer discharges
only small quantities of
steam or water droplets.
13. Small drops flow out of the
water tap.
14. The unit emits a whistle
after serving the coffee.
15. The filter cup comes off the
serving unit.
16. When coffee is
served, some of it drips out
of the edge of the filter cup.
17. Water leaking from the
drain of the serving unit
solenoid.
18. light cream (the coffee
flows out of the spout
rapidly).
19. Dark cream (the coffee
drips out of the spout).
20. Presence of grounds in
coffee cup.
21. Coffee with too little cream
in cup (spurts out of spout).
22. The cream in the cup is too
thin (it disappears after a
few seconds).
23. Presence of depressions in
the coffee grounds (looking
inside the filter cup).
Note: If it is not possible to solve the problem as described above, or if other malfunctions develop, contact
the authorized La San Marco service centre.
CAUse
• Solenoid and/or pump fed con-
unit tinuously.
• Electric circuit of unit improp-
erly connected.
• Worn gasket on tap.
• Worn gasket on tap.
• Leak from solenoid.
• Faulty operation of expansion
valve.
• High pump pressure.
• Worn gasket under the filter
cup.
being • Worn gasket under the filter
cup.
• Malfunctioning unit solenoid.
• Water leaking from unit cooling
system.
a. Coarse grinding.
b. low pressing pressure.
c. Small quantity of ground cof-
fee.
d. Water temperature below 90°C.
e. Pump pressure above 9 bar.
f. Sprinkler filter on unit clogged.
g. Filter holes widened (filter cup).
a. Fine grinding.
b. High pressing pressure.
c. large quantity of ground coffee.
d. High percolation water tem-
perature.
e. Pump pressure below 9 bar.
f. Sprinkler filter on unit clogged.
g. Filter holes clogged (filter cup).
a. Coffee ground too fine.
b. Worn grinders in grinder-dis-
penser unit.
c. Pump pressure above 9 bar.
d. Sprinkler filter on unit clogged.
e. Filter holes widened (filter cup).
• Sprinkler filter
clogged.
• Coffee extraction takes a long
time due to clogged filter.
• Coffee extraction too fast due
to clogged sprinkler filter.
• Water temperature too high.
• Sprinkler filter partly clogged.
• Low amount of ground coffee
for the fiter used.
sOlUTiOn
• Short-circuited control unit relay.
• Replace the electronic control unit.
• Check the connection and correct it
(see wiring diagram).
• Replace the gasket.
• Replace the gasket.
• Check the solenoid and if necessary
replace it.
• Check the expansion valve and if
necessary replace it. Calibrate the
valve at 12 bar.
• Check the pump operating pressure.
Calibrate the pump at 9 bar.
• Replace the gasket.
• Clean the serving unit and the filter cup.
• Replace the gasket.
• Clean the serving unit and the filter
cup.
• Check the unit solenoid.
• Check the plunger on the solenoid
and clean the solenoid.
• Replace the solenoid.
• Check the cooling tube and the seal
rings inside the unit.
a. Finer grinding.
b. Increase the pressure.
c. Increase the quantity of ground coffee.
d. Increase the pressure in the boiler.
e. Decrease the pump pressure.
f. Check and clean with blind filter or
replace.
g. Check and replace the filter.
a. Coarser grinding.
b. Reduce the pressure.
c. Decrease the quantity of ground coffee.
d. Decrease the boiler pressure.
e. Increase the pump pressure.
f. Check and clean with blind filter or
replace.
g. Check and replace the filter.
a. Coarser grinding.
b. Replace the grinders.
c. Decrease the pump pressure.
d. Check and clean with blind filter or
replace.
e. Check and replace filter.
on unit • Check and clean with blind filter or
replace.
• Clean or replace the filter.
• Clean or replace the sprinkler filter.
• Lower the temperature in the boiler.
• Clean or replace the sprinkler filter.
• Adjust the amount of ground coffee.
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